Clarify the 'rows' parameter in create_append_path This is extracted from a larger patch to improve the UNION planner. While working on that, I found myself having to check what the 'rows' parameter is for. It's not obvious that passing a negative number is the way to have the rows estimate calculated and to find that out you need to read code in create_append_path() and in cost_append().
Discussion: https://postgr.es/m/caaphdvpb_63xqodmxkuf8vb9m7cxyuyt4swvegqequ-gb7q...@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/87027cb55bf7b33416880f7f5f5e67f4202d5881 Modified Files -------------- src/backend/optimizer/util/pathnode.c | 4 ++++ 1 file changed, 4 insertions(+)
